English Reference

Word

boiler

Phoneticsboil·er, stress on the first syllable

US/ˈbɔɪɫɝ/

UK/bˈɔɪlɐ/

Definitions

01heating system

B1 · Intermediate Countable noun

n. a machine that heats water to provide heat and hot water for a house or building.

n. a domestic or industrial device used to heat water or produce steam, typically for central heating or hot water supply.

“The house was freezing because the boiler broke down during the night.”

“The landlord agreed to replace the aging gas boiler with a more energy-efficient model before the winter temperatures arrived.”

Synonyms

02cooking vessel

B2 · Upper Intermediate Countable noun Cooking

n. a large pot or container used for boiling or steaming food.

n. a large vessel or container designed for boiling, steaming, or heating food items in bulk.

“We used a large boiler to cook enough corn for the whole party.”

“The industrial kitchen was equipped with several stainless steel boilers for preparing large quantities of soup and stock.”

Synonyms

03derogatory for a woman

C2 · Proficiency Countable noun British English · Slang · Vulgar

n. a very rude and old-fashioned way to describe an older woman you think is unattractive.

n. a derogatory and offensive slang term used to describe an older woman, often implying she is unattractive or unpleasant.

“He was being very rude and called the neighbour an old boiler.”

“The comedian's use of the term 'old boiler' was widely criticised for being both sexist and outdated.”

Teaching tip

This term is considered highly offensive and sexist in modern British English; learners should recognize it but never use it.

Synonyms

hagcrone

Etymology

From boil + -er.

Shortening of boilerplate

Etymology adapted from Wiktionary, available under CC BY-SA 4.0.

Word family

NOUN

boiler(B1)

This entry

Exam level
CambridgeCambridgeCambridge English QualificationsThe exam suite from Cambridge University Press & Assessment, from A1 Movers up to C2 Proficiency. The benchmark names double as CEFR labels.B1 PreliminaryIELTSIELTSInternational English Language Testing SystemThe 0–9 band test co-owned by the British Council, IDP, and Cambridge. Used for university entry, work, and migration.4.0–5.0TOEFL iBTTOEFL iBTTest of English as a Foreign Language, Internet-Based TestETS's academic English test, the standard route for US university admissions. Scored 0–120, with a 1–6 scale since 2026.1–6 scale: 3.0–3.544–71TOEICTOEICTest of English for International CommunicationETS's workplace English test, big in Japan and Korea. Listening & Reading scores 10–990 and tops out at C1.550–784
Frequency
Frequent
Level
B1 · Intermediate
Updated

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English Reference